My pediatrician, neighbors, friends, mommy-know-how books, and my own sanity tell me that a 4 month old is capable of sleeping through the night. My own 4 month old is not so sure. I have dedicated this week to helping him find his eating and sleeping routine during the day so maybe we can have better nights. He got thrown off a month ago during our Hawaii trip and hasn't fully recovered. He thinks bedtime is 11 pm. So last night, after 90 minutes of "discussion", he went to sleep at 9:30, only woke up once in the night, and got up for the day at 7:30. BEAUTIFUL!!!